Writing instrument



FIG. 1 is a top, right front perspective view of a writing instrument showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a right side elevational view, the left side being a mirror image thereof;

FIG. 4 is a rear elevational view;

FIG. 5 is a top plan view;

FIG. 6 is a bottom plan view; and,

FIG. 7 is a front elevational view thereof in an exploded condition. 

The ornamental design for a writing instrument, as shown and described. 